Load brake equipment



C. C. FARMER.

LOAD BRAKE EQUIPMENT.

APPLICATION FILED JULY 10.4920.

1,400,595; Patented Dec. 20, 1921.

3 SHEETS-SHEET I.

LOAD CYL.

| Nil v WWII TAKI UP V 1 M W"- ATTORNEY CLG. FABMER.

LOAD BRAKE EQUIPMENT.

APPLICATION FILED- JULY 10. 1920,.

W W l w INVENTOR CLYDE. c. F'ARMER ATTORNEY PatentedDec. 20, 1921.

3 SHEEIS-SHEET 2.

C. C. FARMEH.

L-OAD BRAKE EQUIPMENT. I

APPLICATION FILED JULY 10, 1920.

v %& R 1T DA 9H T .R Wm W D d U m Y B t a P rare CLYDE G. FARIVIER, OF EDGEWOOD, PENNSYLVANIA, ASSIG-NOR TO THE WESTING- HOUSE AIR BRAKE GOIVHPANY, O1 KR ELMERDING, SYLVALNIA, A CORPORA- TION OF PENNSYLVANIA.

LOAD BRAKE EQUIPMENT.

leec es.

Specification of Letters Patent.

Patented Dec. 20, 1921.

To all whom may concern Be it l'llOWD that I, CLYDE (I. FARMER, a citizen ot the United States, residing at ifidgewood, in the county of Allegheny and State ol' Pennsylvania, have invented new and useful Improvements in Load Brake Equipments, of which the following is a specification.

This invention relates to fluid pressure res. and more particularly to a brake regulated according as the car is empty or loaded.

in order to hold the brakes applied while operating on grades, so as to permit the rake system to be recharged with fluid unwill therefore be apparent that a retaining exhaust port corresponding with the ze cylinder volume of that car.

pressure "brake equipment in which e of exhaust through the retaining valve determined. at a point other than at the retaining valve, so that a retaining valve having the same sized exhaust port may be used in all cases regardless of the brake cyliuder volume.

Another object of my invention is to provide an empty and load fluid pressure brake equipment in which the rate of exhaust through. the retaining valve is maintained uniform for the brake cylinder volume employed whether the car is empty or loaded.

Another feature of my invention is to associate the retaining valve structure with the brake controlling valve structure so as to avoid the use of connecting pipes as heretoiore employed. i

e object of my invention is to provide' In the accompanying drawings; Figure 1 is a sectional diagrammatic view oi an empty and load brake controlling valve device with my improven'lents applied thereto showing the parts adjusted for empty car braking; Fig. 2 a similar view, showing the parts adjusted for loaded car braking; Fig. 3 a diagrammatic view of an empty and load brake equipment for a car Fig. 4 a section on the line lV-TZV of Fig. 3; and Fig. 5 a section on the line V-V of Fig. 3.

The empty and load brake controlling valve device shown in the drawings and to which my improvements are applied is suhstantially the same as that d sclosed in the pending application of 'l. Thomas, Serial Y0. 821 399, filed .September 3 1919, and comprises a triple valve section 1, a changeover valve section 2, and a reservoir chamber section 3, the sections being secured together to form a unitary structure.

The triple valve section 1 has a piston chamber 4t connected by passage to the usual. brake pipe 6 a; d containing a piston 7, and a valve chamber 8 connected by passage 9 to auxiliary reservoir chamber 10 and containing a main slide valve 11, and graduating slide valve 12 adapted to be operated by piston 7.

In the change-over valve section 2 there is a piston chamber 13 containing a piston 14: and a valve chamber 15, connected by a passage 16 to the piston chamber l and containing a slide valve 17 adaptec to be operated by piston 14 for. adjusting the apparatus for either empty or loaded car brakin A. manually operated valve 18 controls the venting of fluid under pressure from piston chamber 18 for operating the piston 14,

r'lssociated with the change-over valve section 2 is a section 19 having a piston chamber 20 containing a piston 21 and a valve chamber 22, containing a slide valve 23, and having a piston chamber 24 containing a piston 25 and a valve chamber 26 containing a valve 27 adapted to be operated by piston 25.

The section 19 also contains valvepistons 28 and 29.

The reservoir chamber section 8 contains the auxiliary reservoir chamber 10 and a chamber a orthe triple valve device load resevoir chamber 30, connected'to a passage leading to the seat of the change over slide v lve 17.

A. rctainir C, valve structure 32 is secured to the section 3 and contains a movable member on one side to the pressure oi springs ea, tending to move the memi There are two retaining valves 49 and 43, the retaining valve 42 controllmg communn cation from an exhaust 4A- to a pasis, leading to chamber 4:1, and the retaining valve 1-3 controlling communicm tion from chamber a1 to an atmospheric exhaust port. 46.

s "m in Fig. 3 of be drawing, the

operating chain is contained in a pipe 4:7

l1 leads to a manually controlled chain i device 43, comprising a casing containing a drum.

' ed to be operated by handle 51.

operates the chain.

The operating handle has three positions, open, high pressure, and low pressure, and the parts are locked in the respective positions by providing a pawl 52 on the drum .9, which is adapted to engage steps .53, 54,

and 55 on the cap member 56 of the device,

when the handle is shifted laterally.

A take-up ....lre cylinder 57, an empty car br-he cylinder 58, and aloaded car brake cylinder are connected to the reservoir sectionS by't'he respective pipes 60, 61, and-62.

lnoperatiori,tluid supplied to the brake pipe 6 flows through passage to the piston and thence'through the usual feed groove around the p ston 7 to valve chamber 3, charging the auxiliary reservoir 10 through passage 9.

-t the car is empty, the change-over valve device is adjusted for empty braking, as shown in llig. l, in which the valve 18 is held closed and the valve chamber being charged from piston chamber 4: through passage 16, fluid flows through the feed groove around the piston 14- to piston chamber 13,

and the fluid pressures on opposite sides of the piston being equalized, the spring 63 maintains'the piston 14 and slide valve 17- in the position shown.

it no pressure is to be retained in the brake cylinder, the. handle 51 oi the retaining valvedeviceisplaced in the open posiin one direction, and connected to an.

control communication as carried by aspindle am is secured to the'drum 49, so. that the rotation of the drum by the handle brake cylinders.

that of the hereinbetore mentioned patent application, Serial No. 321,399.

Accordingly, assuming that the brakes have been applied. and "the release of the brakes isto be etlected, the triple valve parts having been shifted to release position in the usual manner, the empty brakecylinder 58, which is theonly brake cylinder cut in at thistime, is connected tothe exhaust through pipe 61, passage 6a cavity in the changeover slide valve ll, passage 66, cavity 67 in, tripple slide valve '11, passage 63, and passage 38, containing a restricted port 70 which limits the rate of exhausttrom the brake cylinder to correspond with the empty brake cylinder. From passage 38. fluid.

flows Jast the ooen valve 36 of the retain ing valve device to chamber 39 and thence to the atmospherethrough port at.

If the apparatus is to be set for loaded car braking, the valve-18 is manually openec, so as to vent fluid from the piston chamber 13 of the change-over valve device to an atmospheric exhaustport 71. The piston 14 is then shifted and moves the slide valve 17 to the load position, as shown in Fig. 2 of the drawings. 7 V

In this position, the load reservoir 30 is connected to the auxiliary reservoir 10, and in applying the brakes, fluid is first suppliedto the take-up brake. cylinder 57 and also flows to valve chamber 26 in valve section 19 and at a predetermined pressure shifts piston 25 and valve 27 to a position for connecting the reservoir volumes to thejempty brake cylinder 58;

Fluid suppliedto the empty brake n der also flows to valve chamber 22 and a a cylinder, the piston 21 and valve 23 .re operated to connect the reservoir volume with the load brake cylinder 59.

The brakes are thus applied in the load position with the force due to the three pr determined pressure in the empty brake In releasing after an application of the brakes, fiuid is released from the empty brake cylinder 58 through passage 6% passage 72, valve chamber 22, passage 73, past check valve 74: to valve chamber 26. Fluid from theload brake cylinder 59' exhausts through passage 75, pastcheclrvalves 7 6 and 74 to valve chamber 26. From valve-chamber 26 fluid from both the empty and load brake cylinders then flows through passage 7'7, cavity 78 in change-over slide valve 17, to passage 79 where it combines with fluid from the tal e-up brake cylinder 57 and flows through passage 8i), past checlr valve 81, through cavity 67 in triple slide valve ll. to passage 68 and passage 38.

In the load position of the change-over val e 17, a cavity 82 connects passages 83 and 8 opening an additional. communication around the restricted port 70,'so that the area of the release passage is increased to correspond with the increased brake cylinder volume handled. Fluid from all the brake cylinders then flows through passage 38, past the valve 36 01 the retaining valve ClGVlCG to the exhaust port 40.

If it is desired to retain a high pressure in the brake cylinder, the handle 51 of the retaining valve operating device is turned to the high pressure position, so that the chain is operated to shift the movable member 33 sulilciently to permit the valve 36 to close, but not far enough to open the valve 37. I

The valve 36 being closed, fluid cannot exhaust through the passage 38 as before, but must exhaust through passage as. In this case, the exhaust from the empty brake cylinder is through passa e 6i, cavity 65, passsage 66, cavity 67, passage 68, passage 38 to passage 83, through cavity 85 in the change over valve 17 to passage 86.

The passage 86 is connected to passage 4a through a restricted port inacholre plug 87, of such size as to give the slow rate oi discharge from the brake cylinder which is desired when the retaining valve is cut in. Fluid tron i passage 44; flows to the retaining valve 42 and ii? at a pressure above the pressure at vhich the retaining valve i2 is set, said retaining valve is opened, so that fluid passes to chamber l-l. l Vhen the pres sure in chamber ll exceeds the pressure at which the retaining valved-3 is set, the valve (i3 is opened to permit the exhaust at the excess pressure to the atmosphere through port 46.

It 1 ill thus he seen that the pressure re= tained in the brake cylinder will. be equal to the combined pressures at which the re tainiieg valves i2 and 43 open,

it the char -erer valvedcvice is set or load braking. vie er must of fluid from all the brake cylinders will through the passage 38, as hercinhetore described in connection with the load pos' .en with the re taining valves cut out, and thence through passage 83, ca ities and 85 inthe changeover valve 17 to passage 88, which connects with the passage through restricted port in'a cholte plug 89 oi larger size than the restricted port in the choke plug 87, so as to permit the rate oi discharge to correspond handled.

The retaining valves then operate to retain pressure in the brake cylinders in the case of the apparatus set for empty car oral;- ing, as hereinhet'ore described.

If it is de ired to retain only a low pressure in the brake cylinder, the handle 51 is turned to the low pressure positier in which the chain is opc ed as to move the member 33 to a pos tion :toropei the valve 37. ll hen the valve 3'? is open, i'luid vented from the brake cylinder flows from passage a l to the retaining valve i2 and pressure in excess of the settingcii this retaining valve flows past c to chainher ell and thence past the open valve 3'? to the enhaust port d0, so that only the retaining valve 42 is cut in and the pressure retained in the brake cylinder will he that corresponding with the setting of the retaining valve 4L2.

The retaining valve if; then limits the pressure either in the empty or load position of the parts, since in either case, fluid is e:-;- haustedthrough the passage l.

Having now described my invention, what ll claim as new and desire to secure by Letters Patent, is:

1. In a fluid pressure brake, the combination with a plurality of bralte cylinders and means for connectiu one or more bralre cylinders intoserviceeccording as the car empty or loaded, of a valve device for re--' taining fluid under pressure inthe hralre cylinders 2nd means for releasin did at one rate through the retaining valve device when one brake cylinder cut in and at a greater rate when a plurality oi brake cylinders are cut in. a

2. In a fluid pressure brake, tion with a plurality of brake c means for connecting one or cylinders into service according empty or loaded, of a valve device for taining fluid under pressure in the brake cyl inders and" means :tor providing a release of fluid under pressure 1t brake cylinders corres ar brake cylinder volume in s in a fluid pressure the ct. tion with a plurality of hralre cylin means for connecting one or more inders into service according z empty or loaded, ot a va taining fluid under pre cylinders and means located between t, brake cylinders and the retaining valve vice for determining the rate of release of fluid under pressure from the hralre cylin ders through the retaining valve device.

4. In a fluid pressure hralrie, the COH1lJiDt tion with a plurality of brake cylinders and means for connecting one or more brake cylinders into service according the car is he ceuihina- :nders and more bralrc car is a empty or loaded, of a valve device for-retaining fluid under pressure in the brake cylinders andmeans providing one rate oi release of fluid from the brake cylinders when the retaining valve device is cut in and another rate of release'when the retaining valve device is cut out; l

In a fluid pressure brake, thecombination with a brake cylinder anda retaining valve device, of means located between the brakecylinder and the retaining valve device for providing one rate of release of fluid from the brake cylinder with the retaining valve cut in and another rate of release with the retaining valve cut out.

6. In a fluid pressure brake, the combination with a plurality of brake cylinders and a retaining valve device for retaining fluid. under pressure inthe brake cylinders,

of a change-over valve device having a position for cutting in one brake cylinder volume and another position for cutting in an increased brake cylinder volume and means controlled by said change-over valve device for determining the port capacity through which fluid is released from the brake cylinders to the retaining valve device.

V 7 Ina fluid pressure brake, the combination'with a plurality of brake cylinders and a retaining valve device, of an empty and load brake controlling valve device having one brake cylinder releaseport capacity cor responding with the brake cylinder volume of anempty can-another release port capacity for the brake cylinder volume of an emptycar with the retaining valve cut in, a third port capacity for a brake cylinder volume corresponding with a loaded car, and a fourth port capacity for a loaded car brake cylinder volume, with the retaining valve cut in. r y

8. In a fluid pressure brake the combination with a plurality of brake cylinders and i a retaining valve device for retaining a predetermined pressure in the brake cylinders,

"of an emptyand load brake controlling valve. device for varying the: brake cylinder volume accordmg' as thes car is empty-or,

loaded and having a different. port area through which fluid is released from..the-

brake cylinders for empty car braking with the retaining'valve cut in orcut out'and for loaded car brakingwith theretaining valve cut in or cutout.

9. Ina fluid pressure brake, the combina tion with a brake controllingvalvedevice,

of a retaining valve device applied tothe controllingvalve device to form a unitary structure and mechanical means adapted to controlling valve device having two brake cylinder exhaustpassages, of a retaining valve device compr1sing a retaining valve; connected torone exhaust passage, a valve for controlling commun1cat1on'irom the other exhaust passage to the atmosphere, and a manually operated member for open ating said valve. V

12. In a fluid pressure brake, the combination with a brake cylinder and a brake controlling valve device having two brake cylinderexhaust ports, of a retaining valve device comprising a pair of retaining valves one or" which is connected to one brake cyl lnder exhaust port, a valve for controlhng communication from said retaining valve to an exhaust port, a valve for controlhng the other brake cylinder exhaust port, and a manually operated member for-actuating said valves 13. In a fluid pressure brake, the combination with a brake cylinder, of a retaining valve device comprising a pair of retaining valves, a valve for controlling the exhaust from one retaining valve, a valve for con trolling a direct brake cylinder exhaust port a and a manually operated member having one position for opening one valve, another position for opening the other valve and a third position in which'both valves are closed. V i

' l l In a fluid pressure brake, the c'ombination with a brake cylinder of aretaining valve devicecomprising a pair of connected retaining valves, a valve. for controlling communication from one retainlng valve'to an atmospherie exhaustport, a valve for controlling the direct exhaust of fluid from the brakecylinder, and a manually operated member having a positionior openingaone' valve, another position for opening the other valve, and an intermediate position in whioh both valves; are closed. 7

In testimony whereof I have hereunto set in hand.

y CLYDE o. FABMER. 

